Definitions
from The Century Dictionary.
- noun Plural of
archegonium .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
archegonium .
Etymologies
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Examples
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The archegonia which is the female organ, and antheridia which is the male organ, are encapsulated.
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The archegonia which is the female organ, and antheridia which is the male organ, are encapsulated.
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If a plant with ripe archegonia is placed in a drop of water, with the lower surface uppermost, and at the same time male plants are put with it, and the whole covered with a cover glass, the archegonia and antheridia will open simultaneously; and, if examined with the microscope, we shall see the spermatozoids collect about the open archegonia, to which they are attracted by the substance forced out when it opens.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell
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The macrospore or embryo-sac produces a prothallium called the endosperm, in which archegonia or corpuscula are formed; and lastly, in typical dicotyledons it is only lately that any trace of a prothallium from the microspore or pollen cell has been discovered, while the macrospore or embryo-sac produces only two or three prothallium cells, known as antipodal cells, and two or three oospheres, known as germinal vesicles.
Scientific American Supplement, No. 531, March 6, 1886 Various
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Previous to their formation the cells at this point divide by walls parallel to the surface of the plant, so as to form several layers of cells, and from the lowest layer of cells the archegonia arise.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell
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_F_, a female prothallium, seen from below, × 12. _ar. _ archegonia.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell
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The sexual generation is a small green thalloid structure called a prothallium, which bears antheridia and archegonia, each archegonium having a neck-canal and oosphere, which is fertilized just as in the moss.
Scientific American Supplement, No. 531, March 6, 1886 Various
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In the female plant there arise at the apex of the stem, surrounded by an envelope of ordinary leaves, several archegonia.
Scientific American Supplement, No. 531, March 6, 1886 Various
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This formation of germinal vesicles and prothallium seems very different from the formation of archegonia and prothallium in Selaginella, for instance; but the link which connects the two is in the gymnosperms, where distinct archegonia in a prothallium are formed.
Scientific American Supplement, No. 531, March 6, 1886 Various
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The archegonia have a shorter neck than those of the ferns, and the neck is straight.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell
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